DirectSound Audio Capture Selection.
On a system with more than one sound device TimeDX must be told which sound card is to be used for
audio input purposes. This selection will determine which sound card DMDX uses
Like the sound output
device there can be several drivers for the same sound card's capture
capabilities, usually there is one called the Primary sound device, then there may be one or two more, both mapped to the same device.
Which one you select can make the difference between
DMDX Audio Capture working or not,
unfortunately the only sure way of knowing is to go with the default selection
and if it's not working or what you want, change it.